5-(pyridin-3-yl)oxazole allosteric modulators of the M4 muscarinic acetylcholine receptor

Abstract

The present invention is directed to 5-(pyridine-3-yl)oxaxole compounds which are allosteric modulators of the M4 muscarinic acetylcholine receptor. The present invention is also directed to uses of the compounds described herein in the potential treatment or prevention of neurological and psychiatric disorders and diseases in which M4 muscarinic acetylcholine receptors are involved. The present invention is also directed to compositions comprising these compounds. The present invention is also directed to uses of these compositions in the potential prevention or treatment of such diseases in which M4 muscarinic acetylcholine receptors are involved.

What is claimed is: 
     
       1. A compound of the formula I: 
       
         
           
           
               
               
           
         
         wherein: 
         A is selected from: benzoimidazole, benzoisoxazole, benzoxazole, benzotriazole, cinnoline, dihydrobenzofuranone, dihydroimidazopyrazine, dihydropyrrolopyridine, furopyridinone, imidazopyridine, indazole, isobenzofuranone, isoindolinone, isoquinoline, oxazolopyridine, phenyl, pyrazolopyridine, pyrrolopyridinone, quinoline, triazolopyrazine, and triazolopyridine; 
         X is —N═ or —C(R 4 )═, and Y is —N═ or —C(R 4 )═, with the proviso that if one of X or Y is —N═, then the other of X or Y is —C(R 4 )═; 
         R 1  is selected from:
 (1) hydrogen, 
 (2) halogen, 
 (3) —CN, 
 (4) —C 1-6 alkyl, which is unsubstituted or substituted with a hydroxy, or 1-3 fluoro, 
 (5) —O—C 1-6 alkyl, which is unsubstituted or substituted with a hydroxy, or 1-3 fluoro, 
 (6) —C≡CH, 
 (7) -pyrazolyl, 
 (8) —(C═O)—NH 2 , and 
 (9) —(C═O)—NH(—C 1-6 alkyl); 
 
         R 2  is selected from:
 (1) hydrogen, 
 (2) halogen, 
 (3) —C 1-6 alkyl, and 
 (4) —NH 2 , 
 or R 1  and R 2  taken together form a cyclopentyl ring, which is unsubstituted or substituted with fluoro, hyrdoxy, C═O, or —(C═O)O(—C 1-6 alkyl); 
 
         R 3  is selected from:
 (1) hydrogen, 
 (2) halogen, 
 (3) —CN, 
 (4) —C 1-6 alkyl, and 
 (5) —NH 2 ; 
 
         R 4  is selected from:
 (1) hydrogen, 
 (2) —CN, 
 (3) chloro, and 
 (4) fluoro; 
 
         R 5  is —C 1-6 alkyl, which is unsubstituted or substituted with:
 (1) fluoro, 
 (2) hydroxy, 
 (3) —CN, 
 (4) —OC 1-6 alkyl, which is unsubstituted or substituted with —C 1-6 alkyl, hydroxy, methoxy, fluoro, or —C 1-6 alkyl-fluoro, 
 (5) —C 3-8 cycloalkyl, which is unsubstituted or substituted with —C 1-6 alkyl, hydroxy, methoxy, fluoro, or —C 1-6 alkyl-fluoro, and 
 (6) phenyl, which is unsubstituted or substituted with —C 1-6 alkyl, hydroxy, methoxy, or 1-3 fluoro; 
 
         each of R 8 , R 9  and R 10  is independently selected from:
 (1) hydrogen, 
 (2) halo, 
 (3) —OH, 
 (4) —C 1-6 alkyl, which is unsubstituted or substituted with a hydroxy, —OC 1-6 alkyl, cyclopropyl, cyclobutyl, or 1-3 fluoro, 
 (5) —OC 1-6 alkyl, which is unsubstituted or substituted with a hydroxy, —OC 1-6 alkyl, cyclopropyl, cyclobutyl, or 1-3 fluoro, 
 (6) —C 3-6 cyclolkyl, which is unsubstituted or substituted with a hydroxy, methoxy, or 1-3 fluoro, 
 (7) —NH 2 , —NH(C 1-6 alkyl), or —N(C 1-6 alkyl) 2 , wherein the —C 1-6 alkyl, is unsubstituted or substituted with hydroxy, methoxy, or 1-3 fluoro, 
 (8) azetidinyl, pyrrolidinyl, piperidinyl, or piperazinyl, wherein the azetidinyl, pyrrolidinyl, piperidinyl, or piperazinyl, is unsubstituted or substituted with hydroxy, methoxy, or 1-3 fluoro, and 
 (9) —CN; 
 
         or a pharmaceutically acceptable salt thereof. 
       
     
     
       2. The compound of  claim 1  of the formula Ia: 
       
         
           
           
               
               
           
         
         or a pharmaceutically acceptable salt thereof. 
       
     
     
       3. The compound of  claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 1  is selected from:
 (1) hydrogen, 
 (2) fluoro, 
 (3) chloro, 
 (4) —CN, and 
 (5) methyl. 
 
     
     
       4. The compound of  claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 2  is hydrogen, R 3  is hydrogen and R 1  is selected from:
 (1) hydrogen, 
 (2) fluoro, 
 (3) chloro, 
 (4) —CN, and 
 (5) methyl. 
 
     
     
       5. The compound of  claim 1 , or a pharmaceutically acceptable salt thereof, wherein X is CH and Y is N. 
     
     
       6. The compound of  claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 5  is —C 1-6 alkyl, which is unsubstituted or substituted with fluoro, or —CH 2 -cyclopentyl, which is unsubstituted or substituted with methyl or fluoro. 
     
     
       7. The compound of  claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 5  is selected from:
 (1) 2,2-dimethylpropyl, 
 (2) 2,2-difluorobutyl, 
 (3) 3-methylbutyl, 
 (4) 3-fluoro-3-methylbutyl, 
 (5) neopentyl, 
 (6) 1-(methylcyclopentyl)methyl, 
 (7) 1-(fluorocyclopentyl)methyl, 
 (8) cyclopentyl-3,3,3-trifluoro-2,2-dimethylpropyl, 
 (9) 1-(cyclohexylmethyl), and 
 (10) (1-(trifluromethyl)cyclopropyl)methyl. 
 
     
     
       8. The compound of  claim 1 , or a pharmaceutically acceptable salt thereof, wherein each of R 8 , R 9  and R 10  is independently selected from:
 (1) hydrogen, 
 (2) halo, 
 (3) —OH, 
 (4) —C 1-6 alkyl, which is unsubstituted or substituted with a hydroxy, or 1-3 fluoro, 
 (5) —OC 1-6 alkyl, which is unsubstituted or substituted with a hydroxy, or 1-3 fluoro, and 
 (6) cyclopropyl. 
 
     
     
       9. The compound of  claim 1 , or a pharmaceutically acceptable salt thereof, wherein each of R 8 , R 9  and R 10  is independently selected from:
 (1) hydrogen, 
 (2) fluoro, 
 (3) —CH 3 , 
 (4) —CF 3 , and 
 (5) —OCH 3 , and 
 (6) cyclopropyl. 
 
     
     
       10. A compound which is selected from:
 2-(cyclopentylmethyl)-5-(6-methyl-2-(quinolin-7-yl)pyridin-3-yl)oxazole; 
 2-(cyclopentylmethyl)-5-(2-(3-methoxycinnolin-7-yl)-6-methylpyridin-3-yl)oxazole; 
 6-(3-(2-(cyclopentylmethyl)oxazol-5-yl)pyridin-2-yl)-2-methylisoindolin-1-one; 
 2-methyl-6-(3-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)-6,7-dihydro-5H-cyclopenta[b]pyridin-2-yl)isoindolin-1-one; 
 2-(2-fluoroquinolin-7-yl)-3-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)-6,7-dihydro-5H-cyclopenta[b]pyridin-7-yl acetate; 
 6-(2-methyl-3-oxoisoindolin-5-yl)-5-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)picolinonitrile; 
 5-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 6-(6-fluoro-3-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)pyridin-2-yl)-2-methylisoindolin-1-one; 
 6-(5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)-5-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)picolinonitrile; 
 6-methyl-3-(3-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)-6,7-dihydro-5H-cyclopenta[b]pyridin-2-yl)-5H-pyrrolo[3,4-b]pyridine-5,7(6H)-dione; 
 5-(2-neopentyloxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 6-(6-methyl-5-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-3-yl)-5-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)picolinonitrile; 
 5-(6-(difluoromethyl)-2-(quinolin-7-yl)pyridin-3-yl)-2-neopentyloxazole; 
 5-(6-(difluoromethyl)-2-(3-methoxycinnolin-7-yl)pyridin-3-yl)-2-neopentyloxazole; 
 6-(6-(difluoromethyl)-3-(2-neopentyloxazol-5-yl)pyridin-2-yl)-2-methylisoindolin-1-one; 
 6-(imidazo[1,2-a]pyridin-7-yl)-5-(2-neopentyloxazol-5-yl)picolinonitrile; 
 6-methyl-3-(3-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)-6,7-dihydro-5H-cyclopenta[b]pyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-5-one; 
 6-(6-methyl-5-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-3-yl)-5-(2-neopentyloxazol-5-yl)picolinonitrile; 
 5-(6-(difluoromethyl)-2-(imidazo[1,2-a]pyridin-7-yl)pyridin-3-yl)-2-neopentyloxazole; 
 3-(6-(difluoromethyl)-3-(2-neopentyloxazol-5-yl)pyridin-2-yl)-6-methyl-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-5-one; 
 6-(imidazo[1,2-a]pyridin-7-yl)-5-(2-((1-(trifluoromethyl)cyclopropyl)methyl)oxazol-5-yl)picolinonitrile; 
 6-(2-methyl-3-oxoisoindolin-5-yl)-5-(2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazol-5-yl)picolinonitrile; 
 6-(quinolin-7-yl)-5-(2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazol-5-yl)picolinonitrile; 
 5-(6-(difluoromethyl)-2-(quinolin-7-yl)pyridin-3-yl)-2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazole; 
 5-(6-(difluoromethyl)-2-(imidazo[1,2-a]pyridin-7-yl)pyridin-3-yl)-2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazole; 
 6-(6-(difluoromethyl)-3-(2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazol-5-yl)pyridin-2-yl)-2-methylisoindolin-1-one; 
 5-(5-fluoro-2-(imidazo[1,2-a]pyridin-7-yl)pyridin-3-yl)-2-neopentyloxazole; 
 6-(imidazo[1,2-a]pyridin-7-yl)-5-(2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazol-5-yl)picolinonitrile; 
 5-(2-(cyclobutylmethyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-([1,2,4]triazolo[4,3-a]pyridin-7-yl)-6-(difluoromethyl)pyridin-3-yl)-2-neopentyloxazole; 
 5-(2-isopentyloxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 6-(2-methylimidazo[1,2-a]pyridin-7-yl)-5-(2-neopentyloxazol-5-yl)picolinonitrile; 
 6-(2-methylimidazo[1,2-a]pyridin-7-yl)-5-(2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazol-5-yl)picolinonitrile; 
 6-(2-methyl-[1,2,4]triazolo[1,5-a]pyridin-7-yl)-5-(2-neopentyloxazol-5-yl)picolinonitrile; 
 6-(3-methyl-[1,2,4]triazolo[4,3-a]pyridin-7-yl)-5-(2-neopentyloxazol-5-yl)picolinonitrile; 
 5-(5-(imidazo[1,2-a]pyridin-7-yl)imidazo[1,5-a]pyridin-6-yl)-2-neopentyloxazole; 
 6-(2-(methoxymethyl)imidazo[1,2-a]pyridin-7-yl)-5-(2-neopentyloxazol-5-yl)picolinonitrile; 
 6-(imidazo[1,2-a]pyridin-7-yl)-5-(2-(3,3,3-trifluoro-2-methylpropyl)oxazol-5-yl)picolinonitrile; 
 6-(6-(cyclopropylmethyl)-5-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-3-yl)-5-(2-neopentyloxazol-5-yl)picolinonitrile; 
 6-(imidazo[1,2-a]pyridin-7-yl)-5-(2-(4,4,4-trifluoro-3-methylbutyl)oxazol-5-yl)picolinonitrile; 
 2-(2-methyl-3-oxoisoindolin-5-yl)-3-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)-5,6-dihydro-7H-cyclopenta[b]pyridin-7-one; 
 2-(2-fluoroquinolin-7-yl)-3-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)-6,7-dihydro-5H-cyclopenta[b]pyridin-7-ol; 
 2-(2-fluoroquinolin-7-yl)-3-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)-5,6-dihydro-7H-cyclopenta[b]pyridin-7-one; 
 3-(7-fluoro-3-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)-6,7-dihydro-5H-cyclopenta[b]pyridin-2-yl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-5-one; 
 6-(3-(2-(cyclopentylmethyl)oxazol-5-yl)-6-methylpyridin-2-yl)-2-methylisoindolin-1-one; 
 5-(2-(cyclopentylmethyl)oxazol-5-yl)-6-(6-(cyclopropylmethyl)-5-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-3-yl)picolinonitrile; 
 3-(3-(2-(cyclopentylmethyl)oxazol-5-yl)-6,7-dihydro-5H-cyclopenta[b]pyridin-2-yl)-6-(cyclopropylmethyl)-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-5-one; 
 3-(3-(2-(cyclopentylmethyl)oxazol-5-yl)-6,7-dihydro-5H-cyclopenta[b]pyridin-2-yl)-6-methyl-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-5-one; 
 2-(4-fluorobenzyl)-5-(2-(3-methoxycinnolin-7-yl)-6-methylpyridin-3-yl)oxazole; 
 5-(2-(cyclopentylmethyl)oxazol-5-yl)-6-(5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)picolinonitrile; 
 2-(cyclopentylmethyl)-5-(2-(5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)-6-methylpyridin-3-yl)oxazole; 
 5-(6-chloro-2-(5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)pyridin-3-yl)-2-(cyclopentylmethyl)oxazole; 
 5-(2-(cyclopentylmethyl)oxazol-5-yl)-6-(5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)picolinonitrile; 
 5-(2-(5,6-dihydroimidazo[1,2-a]pyrazin-7(8H)-yl)-6-methylpyridin-3-yl)-2-(4-fluorobenzyl)oxazole; 
 5-(2-(cyclopropylmethyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-isobutyloxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-(cyclopropylmethyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-(cyclopropylmethyl)oxazol-5-yl)-6-(imidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(cyclopentylmethyl)-4-methyloxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-(3,3-dimethylbutyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-(3,3-dimethylbutyl)oxazol-5-yl)-6-(imidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 6-(imidazo[1,2-a]pyridin-7-yl)-5-(2-(3,3,3-trifluoropropyl)oxazol-5-yl)picolinonitrile; 
 5-(2-(2-cyclopropyl-2-hydroxyethyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-(2-cyclopropyl-2-fluoroethyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-(2-cyclopropyl-2-fluoroethyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-((1-fluorocyclopentyl)methyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-((1-fluorocyclobutyl)methyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-(2-ethyl-2-fluorobutyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-((1-hydroxycyclopentyl)methyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-((1-fluorocyclopentyl)methyl)oxazol-5-yl)-6-(imidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-((1-fluorocyclopentyl)methyl)oxazol-5-yl)-6-(imidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 2-((1-fluorocyclopentyl)methyl)-5-(2-(imidazo[1,2-a]pyridin-7-yl)pyridin-3-yl)oxazole; 
 5-(2-((1-fluorocyclopentyl)methyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(2-fluoro-2-methylpropyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-((1-hydroxycyclopentyl)methyl)oxazol-5-yl)-6-(2-methyl-3-oxoisoindolin-5-yl)picolinonitrile; 
 5-(2-((1-fluorocyclopentyl)methyl)oxazol-5-yl)-6-(2-methyl-3-oxoisoindolin-5-yl)picolinonitrile; 
 5-(2-(3-fluoro-2,3-dimethylbutyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-(2-cyclopropyl-2-fluoroethyl)oxazol-5-yl)-6-(imidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(2-cyclopropyl-2-fluoroethyl)oxazol-5-yl)-6-(imidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(2-fluoro-2-methylpropyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(2-cyclopropyl-2-fluoroethyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(2-cyclopropyl-2-fluoroethyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 6-(1,2-dimethyl-1H-benzo[d]imidazol-5-yl)-5-(2-(2-fluoro-2-methylpropyl)oxazol-5-yl)picolinonitrile; 
 5-(2-(2-fluoro-2-methylbutyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 2-((1-fluorocyclopentyl)methyl)-5-(2-(2-methylimidazo[1,2-a]pyridin-7-yl)pyridin-3-yl)oxazole; 
 5-(2-(2-hydroxy-3-methylbutyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(cyclopropylmethyl)oxazol-5-yl)-6-(2-(methoxymethyl)imidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(3,3-difluoro-2-methylpropyl)oxazol-5-yl)-6-(imidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 6-(2-methylimidazo[1,2-a]pyridin-7-yl)-5-(2-(3,3,3-trifluoro-2-methylpropyl)oxazol-5-yl)picolinonitrile; 
 6-(6-(2-fluoroethyl)-5-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-3-yl)-5-(2-((1-methylcyclopentyl)methyl)oxazol-5-yl)picolinonitrile; 
 2-(cyclopentylmethyl)-5-(2-(5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)pyridin-3-yl)oxazole; 
 5-(2-((3,3-difluorocyclobutyl)methyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-((3,3-difluorocyclobutyl)methyl)oxazol-5-yl)-6-(2-methyl-[1,2,4]triazolo[1,5-a]pyridin-7-yl)picolinonitrile; 
 5-(2-((1-fluorocyclopropyl)methyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(((1S,3S)-3-fluorocyclopentyl)methyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 2-(cyclopentyldifluoromethyl)-5-(2-(3-methoxycinnolin-7-yl)-6-methylpyridin-3-yl)oxazole; 
 5-(2-(3-fluoro-3-methylbutyl)oxazol-5-yl)-6-(quinolin-7-yl)picolinonitrile; 
 5-(2-(3-fluoro-3-methylbutyl)oxazol-5-yl)-6-(imidazo[1,2-a]pyridin-7-yl)picolinonitrile; 
 5-(2-(1,2-dimethyl-1H-benzo[d]imidazol-5-yl)-5-fluoropyridin-3-yl)-2-(3-fluoro-3-methylbutyl)oxazole; 
 6-(2-methylimidazo[1,2-a]pyridin-7-yl)-5-(2-(4,4,4-trifluoro-3-hydroxybutyl)oxazol-5-yl)picolinonitrile; 
 6-(2-methylimidazo[1,2-a]pyridin-7-yl)-5-(2-(3,3,3-trifluoropropyl)oxazol-5-yl)picolinonitrile; 
 6-(2-methylimidazo[1,2-a]pyridin-7-yl)-5-(2-(3,3,4,4,4-pentafluorobutyl)oxazol-5-yl)picolinonitrile; 
 6-(imidazo[1,2-a]pyridin-7-yl)-5-(2-(3,3,4,4,4-pentafluorobutyl)oxazol-5-yl)picolinonitrile; 
 6-(2-methyl-[1,2,4]triazolo[1,5-a]pyridin-7-yl)-5-(2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazol-5-yl)picolinonitrile; 
 6-(1,2-dimethyl-1H-benzo[d]imidazol-5-yl)-5-(2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazol-5-yl)picolinonitrile; 
 5-(2-(3,3-difluorobutyl)oxazol-5-yl)-6-(2-methyl-[1,2,4]triazolo[1,5-a]pyridin-7-yl)picolinonitrile; 
 6-(1,2-dimethyl-1H-benzo[d]imidazol-5-yl)-5-(2-(3,3,3-trifluoropropyl)oxazol-5-yl)picolinonitrile; 
 6-(1-methyl-1H-benzo[d]imidazol-5-yl)-5-(2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazol-5-yl)picolinonitrile; 
 5-(2-(1-methyl-1H-benzo[d]imidazol-5-yl)pyridin-3-yl)-2-(3,3,3-trifluoro-2,2-dimethylpropyl)oxazole; 
 5-(2-(3-fluoro-3-methylbutyl)oxazol-5-yl)-6-(2-methylimidazo[1,2-a]pyridin-7-yl)picolinonitrile; and 
 6-(1,2-dimethyl-1H-benzo[d]imidazol-5-yl)-5-(2-(3-fluoro-3-methylbutyl)oxazol-5-yl)picolinonitrile; 
 or a pharmaceutically acceptable salt thereof. 
 
     
     
       11. A pharmaceutical composition which comprises an inert carrier and a compound of  claim 1 , or a pharmaceutically acceptable salt thereof. 
     
     
       12. A method for the treatment of a neurological and/or psychiatric disorder associated with muscarinic acetylcholine receptor dysfunction in a mammal comprising the step of administering at least one compound of  claim 1 , or a pharmaceutically acceptable salt of said compound, to a patient in need thereof in an amount effective to treat said disorder. 
     
     
       13. The method of  claim 12 , wherein the mammal has been diagnosed with a need for treatment of the disorder prior to the administering step. 
     
     
       14. The method of  claim 12 , wherein the disorder is a neurological and/or psychiatric disorder associated with mAChR M4 dysfunction. 
     
     
       15. The method of  claim 12 , wherein the disorder is a psychotic disorder. 
     
     
       16. The method of  claim 15 , wherein the psychotic disorder is selected from schizophrenia, psychotic disorder, brief psychotic disorder, schizophreniform disorder, schizoaffective disorder, delusional disorder, shared psychotic disorder, catastrophic schizophrenia, postpartum psychosis, psychotic depression, psychotic break, tardive psychosis, myxedematous psychosis, occupational psychosis, menstrual psychosis, secondary psychotic disorder, bipolar I disorder with psychotic features, and substance-induced psychotic disorder. 
     
     
       17. The method of  claim 12 , wherein the disorder is a cognitive disorder. 
     
     
       18. The method of  claim 17 , wherein the cognitive disorder is selected from amnesia, dementia, delirium, amnestic disorder, substance-induced persisting delirium, dementia due to HIV disease, dementia due to Huntington's disease, dementia due to Parkinson's disease, Parkinsonian-ALS demential complex, dementia of the Alzheimer's type, age-related cognitive decline, and mild cognitive impairment.